Tenant Leases (Future Minimum Rentals To Be Received Under Non-Cancelable Operating Leases) (Details) (USD $)
In Thousands
9 Months Ended
Sep. 30, 2011
Tenant Leases [Abstract] 
October 1 through December 31, 2011$ 149,754
2012576,565
2013503,946
2014437,558
2015367,644
2016 and thereafter1,450,215
Total$ 3,485,682
Operating leases with various expiration dates through year2033